An important thing to know is that this procedure install the froyo update.Zip file only if you have a stock model. The firmware is posted on official Google servers. Also, this will not work if you have a leaked update installed or if your phone is rooted. A guide for the rooted N1 will be available later this day.

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For connecting to remote desktop of another computer (via internet or network) and controls. Also connecting to VNCServer through Repeater or directly to VNCServer and a lot of other configuration options. For more details VNCServer